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Search: WFRF:(Apps Kevin)

  • Result 1-3 of 3
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1.
  • Lakens, Daniel, et al. (author)
  • Justify your alpha
  • 2018
  • In: Nature Human Behaviour. - : Nature Publishing Group. - 2397-3374. ; 2:3, s. 168-171
  • Journal article (peer-reviewed)abstract
    • In response to recommendations to redefine statistical significance to P ≤ 0.005, we propose that researchers should transparently report and justify all choices they make when designing a study, including the alpha level.
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2.
  • Fischer, Debra A., et al. (author)
  • M2K. II. A Triple-Planet System Orbiting Hip 57274
  • 2012
  • In: Astrophysical Journal. - 0004-637X .- 1538-4357. ; 745:1, s. 21-
  • Journal article (peer-reviewed)abstract
    • Doppler observations from Keck Observatory have revealed a triple-planet system orbiting the nearby K4V star, HIP 57274. The inner planet, HIP 57274b, is a super-Earth with M sin i = 11.6 M-circle plus (0.036 M-Jup), an orbital period of 8.135 +/- 0.004 days, and slightly eccentric orbit e = 0.19 +/- 0.1. We calculate a transit probability of 6.5% for the inner planet. The second planet has M sin i = 0.4 M-Jup with an orbital period of 32.0 +/- 0.02 days in a nearly circular orbit (e = 0.05 +/- 0.03). The third planet has M sin i = 0.53 M-Jup with an orbital period of 432 +/- 8 days (1.18 years) and an eccentricity e = 0.23 +/- 0.03. This discovery adds to the number of super-Earth mass planets with M sin i < 12 M-circle plus that have been detected with Doppler surveys. We find that 56% +/- 18% of super-Earths are members of multi-planet systems. This is certainly a lower limit because of observational detectability limits, yet significantly higher than the fraction of Jupiter mass exoplanets, 20% +/- 8%, that are members of Doppler-detected, multi-planet systems.
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3.
  • Howard, Andrew W., et al. (author)
  • The California planet survey. I. four new giant exoplanets
  • 2010
  • In: Astrophysical Journal. - 0004-637X .- 1538-4357. ; 721:2, s. 1467-1481
  • Journal article (peer-reviewed)abstract
    • We present precise Doppler measurements of four stars obtained during the past decade at Keck Observatory by the California Planet Survey (CPS). These stars, namely, HD 34445, HD 126614, HD 13931, and Gl 179, all show evidence for a single planet in Keplerian motion. We also present Doppler measurements from the Hobby-Eberly Telescope (HET) for two of the stars, HD 34445 and Gl 179, that confirm the Keck detections and significantly refine the orbital parameters. These planets add to the statistical properties of giant planets orbiting near or beyond the ice line, and merit follow-up by astrometry, imaging, and space-borne spectroscopy. Their orbital parameters span wide ranges of planetary minimum mass (M sin i = 0.38-1.9 M-Jup), orbital period (P = 2.87-11.5 yr), semimajor axis (a = 2.1-5.2 AU), and eccentricity (e = 0.02-0.41). HD 34445 b (P = 2.87 yr, M sin i = 0.79 MJup, e = 0.27) is a massive planet orbiting an old, G-type star. We announce a planet, HD 126614 Ab, and an M dwarf, HD 126614 B, orbiting the metal-rich star HD 126614 (which we now refer to as HD 126614 A). The planet, HD 126614 Ab, has minimum mass M sin i = 0.38 MJup and orbits the stellar primary with period P = 3.41 yr and orbital separation a = 2.3 AU. The faint M dwarf companion, HD 126614 B, is separated from the stellar primary by 489 mas (33 AU) and was discovered with direct observations using adaptive optics and the PHARO camera at Palomar Observatory. The stellar primary in this new system, HD 126614 A, has the highest measured metallicity ([ Fe/ H] = + 0.56) of any known planet-bearing star. HD 13931 b (P = 11.5 yr, M sin i = 1.88 MJup, e = 0.02) is a Jupiter analog orbiting a near solar twin. Gl 179 b (P = 6.3 yr, M sin i = 0.82 M-Jup, e = 0.21) is a massive planet orbiting a faint M dwarf. The high metallicity of Gl 179 is consistent with the planet-metallicity correlation among M dwarfs, as documented recently by Johnson & Apps.
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  • Result 1-3 of 3
Type of publication
journal article (3)
Type of content
peer-reviewed (3)
Author/Editor
Howard, Andrew W. (2)
Isaacson, Howard (2)
Fischer, Debra A. (2)
Valenti, Jeff A. (2)
Marcy, Geoffrey W. (2)
Wright, Jason T. (2)
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Apps, Kevin (2)
Kenny, David A. (1)
Johansson, Christer (1)
Albers, Casper J. (1)
Szymkowiak, Andrew (1)
Ingre, Michael (1)
Danielsson, Henrik (1)
Grange, James A. (1)
Hasselman, Fred (1)
Spies, Jeffrey R. (1)
van Assen, Marcel A. ... (1)
Carlsson, Rickard, 1 ... (1)
Sjoerds, Zsuzsika (1)
Piskunov, Nikolai (1)
Zwaan, Rolf A. (1)
Cochran, William D. (1)
Endl, Michael (1)
Buchanan, Erin M. (1)
Nilsonne, Gustav, 19 ... (1)
Collins, Gary S. (1)
Williams, Donald R. (1)
Johnson, John A. (1)
De Xivry, Jean Jacqu ... (1)
Holmes, Nicholas P. (1)
Lepine, Sebastien (1)
Anderson, Jay (1)
Lukavský, Jiří (1)
McFarland, Colin (1)
Earp, Brian D (1)
Ziano, Ignazio (1)
Gaidos, Eric (1)
Giguere, Matthew J. (1)
Clubb, Kelsey I. (1)
Mann, Andrew (1)
Moriarty, John (1)
Brewer, John (1)
Spronck, Julien F. P ... (1)
Schwab, Christian (1)
Van Calster, Ben (1)
Yarkoni, Tal (1)
Pfuhl, Gerit (1)
Johnson, John Asher (1)
Bernat, David (1)
Henry, Gregory W. (1)
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University
Uppsala University (2)
Stockholm University (1)
Linköping University (1)
Lund University (1)
Linnaeus University (1)
Karolinska Institutet (1)
Language
English (3)
Research subject (UKÄ/SCB)
Natural sciences (3)
Social Sciences (2)
Medical and Health Sciences (1)

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